Device for inspecting combustion in furnaces, flues, and the like



v1. (5. w. HENTZE. DEVICE FOR INSPECTINGCOMBUSTION IN FURNACES. FLUES,AND THE LIKE- APPLICATION FILED SEPT. 6, I919.

1,41 0, 1 8 1 Pa ented Man 21, 1922.

fnvenfor:

UNITED STATES PATENT oFF c JOHAN GUSTAF WOLLMAR HINTZE, 0F HELSINGBORG,SWEDEN.

. DEVICE non Insrno'rme COMBUSTION 11v FURNACES, FLUES, AND THE LIKE.

" Application filed September To aZLwZm/a it may concern Be "it knownthat I, JoHAN GUs'rAr lVoLL- MAR Hin'rzii, a subject of the King ofSweden, residing at Hovidsmansgatan 8, Helsingborg, Sweden, haveinvented certain new and useful Improvement; in Devices for InspectingCombustion inFurnaces, Flues, and the like, of which the following is aspecification.

This invention consists of improved devices for use with furn'acesortheir fiues, for enabling the progressor condition,"of combustion to beascertained so that the quantity of air admitted can be regulated asnearly as possible to that theoretically required for proper combustion.

The devices according to this invention provide for the introduction, atany suitable part of a furnace, or furnace fine, of a current of air andthe observation of the appearance, or behaviour, of a mixture of suchair and the smoke present in the furnace, or flue.

In the accompanying drawing a device in accordance with this inventionis shown in the wall of a furnace. Figure 1 is a vertical section on theline BB Figure 4 of the Wall with the device in place therein, Figure 2is a horizontal section on the line AA Figure 1, Figure 8 shews part ofthe outer side of the furnace wall and Figure 4: shows part of theinside of the same wall.

In the wall a (the outer side of which is on the right hand, and theinner side on the left hand, of Figure 1) two blocks 1) and c of fireclay, or other suitable material, are introduced. The upper block b isprovided with a downwardly directed nozzle d projecting into thepassage-way for the smoke. the opening of said nozzle formingaprolongation of a channel 6 through the block which channelcommunicates with the open air by means of a channel 7 in the wall a. Inthe outerend of the said channel f is a damper 9 preferably consistingof a rotatable plate.

The lower block 0, projects into the passage-way for the smoke and isperforated by an opening it funnel shaped at top, the central axis ofthe said passage and funnel coinciding with that of the mouth of thenozzle. Close below the block 0, a. horizontal channel 2', extendsthrough the wall a the outer end of the said channel i being providedwith a transparent shutter 70.

When the device is to be used. the damper Specification of LettersPatent.

Patented Mar. 21, 1922. e, 1919. serial no. 322,2i0.

g is opened, whenv the chimney draught draws in air in a quantitydepending on the position of the said damper. The air passes into thefurnace, or fine, through the nozzle (Z, and then passes through thevertical opening it, carrying with it a quantity of the smoke after themanner of an injector. The mixture of air and smoke thus obtained andleaving the vertical opening it at its lower end, can be observed fromwithout through the shutter Z2 and passage 2'.

If carbonic oxide, orother combustible gas, be contained in the smoke,combustion takes place this being indicated by flame at the end of theopening'h. If, however, no such gas be present, the introduced air onlycools the smoke and no flame is formed. From this it can be ascertainedwhether the combustion in the furnace is proceeding properly, or not,and the quantity of air introduced into the furnace for combustion canbe regulated accordingly.

In place of two blocks the device may be formed only of one blockprovided with the arrangements described.

On the drawing the device is illustrated as being built into the wall abut it may, if desired, be loose and be arranged in such a manner thatit can be inserted through an opening in the wall and removed therefromafter the observation has been made and the combustion in the furnacehas been properly regulated.

It is not essential that the blocks 7), 0 shall be placed in therelative positions to each other illustrated in the drawing, as theymay, in accordance with the direction of the draught be placed in otherpositions such as side by side, or the block 0 may be placed above theblock b, and the nozzle d, be turned upward In place of making thechannels 9, h, in blocks. of fire clay, or the like, the said channelsmay be constituted by tubes, the one 1'' for the introduction of airbeing placed in wall, a and the channel It being mounted at the innerend of the tube f.

Having now particularly described the nature of my invention and themanner of its operation, what I claim is:

1. In a furnace, flue, or like structure, 7

2. In a furnace, flue, or like structure,

means for detecting incomplete combustion comprising a bent nozzle onthe inner wall of the structure and communicating with the atmospherethrough a channel in said 1 Wall, a damper on the outer end of saidchannel, an injector element in front of the nozzle adapted to direct ajet of mixed air and furnace gases into a region of sufficiently hightemperature to ignite the miX- ture if it contains combustible matter,and an inspection WindoWin said Wall so located that the jet can beviewed through the same.

3. A detector of incomplete combustion as claimed in claim 1, comprisinga block adapted for insertion into the Wall of the structure andcontaining the air admission 2 channel, and another block also adaptedto be inserted into the Wall and containing the second channel.

4. A detector of incomplete combustion as claimed in claim 2, comprisinga block adapted to be inserted into the Wall of the structure and havingthe channel for admitting atmospheric air to the nozzle, and anotherblockalso adapted to be inserted into the wall and containing theinspection 3 Window.

In testimony Wl'lGl'GOfI have aflixed my signature in presence of-twoWitnesses.

JOHAN GUSTAF WOLLMAR HINTZE.

NVitnesses J. A. MARTIN, K. G. GUsTArssoN.

